Oil Leak Repair
GENERAL INFORMATIONOnce the leak has been pinpointed and traced back to its source, the cause of the leak must be determined in order for it to be repaired properly. If a gasket is replaced, but the sealing flange is bent, the new gasket will not repair the leak. The bent flange must be repaired also. Before attempting to repair a leak, check to be sure that the following conditions are correct as they may cause a leak.
GASKETS
1. Oil level/pressure is too high.
2. Plugged vent or drain-back holes.
3. Improperly tightened fasteners or dirty/damaged threads.
4. Warped flanges or sealing surface.
5. Scratches, burrs or other damage to the sealing surface.
6. Damaged or worn gasket.
7. Cracking or porosity of the component.
8. Improper sealant used (where applicable).
SEALS
1. Oil level/pressure is too high.
2. Plugged vent or drain-back holes.
3. Damaged seal bore.
4. Damaged or worn seal.
5. Improper installation.
6. Cracks in component.
7. Manual or output shaft surface scratched, nicked or damaged.
8. Loose or worn bearing causing excess seal wear.
POSSIBLE POINTS OF OIL LEAK
1. Transaxle oil pan or valve body cover or case cover:
^ Attaching bolts not correctly tightened.
^ Improperly installed or damaged gasket.
^ Oil pan or valve body cover mounting face not flat.
2. Case leak:
^ Filler tube "multi-lip seal" damaged or missing.
^ Filler pipe bracket improperly located.
^ TV cable seal missing, damaged or improperly installed.
^ Speed sensor housing and "O" rings damaged or missing.
^ Vehicle speed sensor seal damaged.
^ Manual shaft seal damaged.
^ Transaxle cooler connector fittings loose or damaged.
^ Axle oil seals worn or damaged.
^ Parking lock actuator guide O-ring damaged.
^ Governor pressure pipe plug loose.
^ Line pressure pipe plug loose.
^ Case to case cover gasket damaged.
^ Porous casting.
^ Case to extension case gasket damaged.
^ Servo cover O-ring damaged.
3. Leak at converter end:
^ Converter seal damaged.
- Seal lip cut (Check converter hub for damage).
- Bushing moved forward and damaged.
- Garter spring missing from seal.
^ Converter leak in weld area (Replace torque converter).
^ Porous casting (Case, pump or drive sprocket support).
4. Oil comes out vent pipe or fill tube:
^ Over-filled.
^ Water or coolant in oil (oil will appear milky).
^ Case porous.
^ Incorrect oil level indicator.
^ Plugged vent.
^ Drain back holes plugged.
^ Channel plate to case gasket out of position.